OrigAudio ROK3-W 3.0 Portable Vibration Speaker System for iPod/iPhone - Retail Packaging - White Powered by a built-in rechargeable battery ; Charge for 2 hours and get 10 to 12 hours of play The more hollow the object, the better the sound quality Works with any audio device that has a standard 3.5 mm headphone jack Perfect for: traveling, parties, the office, around the house, and anywhere else you want to Rock-It Includes: Rock-It Portable Vibration Speaker with built-in Lithium Ion Battery, USB Power & Charging Cord, and Two Extra Sticky Pads